干密度对粉煤灰力学性质的影响

Effect of dry density on mechanical properties of fly ash

针对粉煤灰干密度与其力学性质的关系问题,对5种不同干密度下的粉煤灰分别进行了直接剪切、压缩和渗透试验,进行了干密度与力学性质参数的关系分析。结果表明,随着干密度的增大,粉煤灰抗剪强度增大,内摩擦角呈线性增大,粘聚力亦增大,但在低干密度下增大不明显。压缩性随干密度增大而减小,压缩系数与干密度近似呈线性关系。渗透性随干密度增大而减小,渗透系数与孔隙比的关系可由泰勒公式表示。

To study the effect of dry density on the mechanical properties of fly ash,the direct shear tests,compaction tests and seepage tests were carried out respectively for fly ashes with the different dry densities.The relation of the dry density and the parameters of mechanical properties was analyzed.The test results show that the shear strength increases with the increase in dry density.Meanwhile,the angle of internal friction increases lineally and the cohesion increases unbviously.The compressibility of fly ash decreases with the increasing dry density.The relationship between the coefficient of compression and the dry density can be approximately expressed by a linear function.The permeability of fly ash decreases with the increase in dry density.The behavior of the coefficient of permeability and void ratio can be expressed by the equation presented by Taylor.